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The letter Ø and the similar-looking symbol ∅ may refer to:
- ⟨Ø⟩ and ⟨ø⟩, a Scandinavian vowel letter
- ⟨ø⟩, the IPA letter for a close-mid front rounded vowel
- ⟨ɸ⟩, the IPA letter for an unvoiced bilabial fricative
- ⟨θ⟩, the IPA letter for an unvoiced dental fricative
- ⟨∅⟩, the symbol for zero in linguistics
- ⟨Ф⟩ and ⟨ф⟩, the Cyrillic letter ef, corresponding to "f" or "ph"
- ⟨Φ⟩ and ⟨φ⟩, the Greek letter phi, corresponding to "f" or "ph"
- ⟨Θ⟩ and ⟨θ⟩, the Greek letter theta, corresponding to "th"
- ⟨Ѳ⟩ and ⟨ѳ⟩, the Old Cyrillic letter fita, corresponding to "f" and transliterating Greek theta
- ⟨Ө⟩ and ⟨ө⟩, Cyrillic barred O, representing an open-mid front rounded vowel in some Turkic and Mongolic languages
- ⟨中⟩, Chinese logogram meaning "middle" in several languages, and a component of some names of China in Chinese
- Ø is the solo identity of Finnish musician Mika Vainio of electronic music band Pan Sonic
- Ø, Denmark, piece of land in Denmark meaning island
- Slashed zero, a representation of the number 0 (zero) to distinguish it from the letter O
- Empty set ( ) in mathematical set theory
- Diameter, by the symbol ⌀
- Half-diminished seventh chord, in music by the symbol Template:Music
- Plimsoll line (
o), the line where the hull of a ship meets the surface of the water
- Standard state (
o), in chemistry
- In German-speaking countries, Ø is also used as a symbol for average value: average in German is Durchschnitt, directly translated as cut-through.